Downloading all necessary files and stuff like that

Alright, so you want to hack your wii, do you? Good. You have common sense. But there are a couple other things you need before you start.
A) You need to know your Wii system menu version. You can find it if you go to the settings menu and poke around for a few minutes. If you have a black wii or any other color other than white, or if you have updated your wii recently, it'll probably have the System Menu 4.3, which is the hardest to get around in my opinion, but still possible.
B) You need an SD card (2 GB or less and it cannot be an SDHC card)
C) Some form of file extracting tool. I use 7-Zip. It's free, and has the same abilities as most other extracting tools. Get it here: http://www.7-zip.org/
D) To use most of the tools I'm using, you need to have a Windows computer. If you have a Mac, I have only one suggestion: get a Windows computer. Most of the programs I'll be using can only run on Windows.
E) The HackMii installer. Get it here: http://bootmii.org/download/
F) Either a copy of Super Smash Bros. Brawl or Lego Indiana Jones: the Original Adventures. I recommend the Smash Bros. Brawl disk, simply because we're going to hack that one anyway and you might as well have it now.
G) Depending on which game you have, you'll need either the Smash Stack or Indiana Pwns exploit. I think you can guess which one goes with which game.
Get Smash Stack here: http://wiibrew.org/wiki/Smash_Stack (click the download link on the right side of the page)
Get Indiana Pwns here: http://wiibrew.org/wiki/Indiana_Pwns (again, click the download link on the right)
Both of these work equally well, and they work on all System Menu versions.